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Property and Equipment, Estimated Useful Lives (Details)
12 Months Ended
Dec. 31, 2017
Minimum [Member] | Building and Site Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 15 years
Minimum [Member] | Furniture and Equipment [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 3 years
Minimum [Member] | Leasehold Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 2 years
Maximum [Member] | Building and Site Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 45 years
Maximum [Member] | Furniture and Equipment [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 15 years
Maximum [Member] | Leasehold Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property and equipment, useful lives 15 years